package com.lilinling.yinzhi.gateway.filter;

import com.google.gson.JsonObject;
import com.lilinling.common.utils.JwtUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.nio.charset.StandardCharsets;
import java.util.List;

@Component
public class AuthGlobalFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        String path = request.getURI().getPath();

        AntPathMatcher antPathMatcher = new AntPathMatcher();
        if (antPathMatcher.match("/api/**/auth/**",path)) {

            //获取token
            List<String> tokenList = request.getHeaders().get("token");

            //没有token
            if (tokenList == null){
                ServerHttpResponse response = exchange.getResponse();
                return loginOut(response);
            } else {
                //token校验失败
                boolean isCheck = JwtUtils.checkJwtTToken(tokenList.get(0));
                if (!isCheck){
                    ServerHttpResponse response = exchange.getResponse();
                    return loginOut(response);
                }
            }
        }
        //放行
        return chain.filter(exchange);
    }

    /**
     *  定义当前过滤器的优先级
     */
    @Override
    public int getOrder() {
        return 0;
    }

    /**
     * 使用webflux输入请求信息
     */
    private Mono<Void> loginOut(ServerHttpResponse response) {
        JsonObject message = new JsonObject();
        message.addProperty("success",false);
        message.addProperty("code",10999);
        message.addProperty("data","");
        message.addProperty("msg","没有登录");
        byte[] bytes = message.toString().getBytes(StandardCharsets.UTF_8);
        DataBuffer buffer = response.bufferFactory().wrap(bytes);
        //指定编码
        response.getHeaders().add("Content-Type","application/json;charset=UTF-8");
        //输出http响应
        return response.writeWith(Mono.just(buffer));
    }
}
